Method of manufacturing cellulose structures.



UNITED STATES PATENT OFFIGE.

METHOD OF MANUFACTURING GELLULOSE STRUCTURES.

No Drawing.

Specification of Letters Patent. Application filed August 26, 1908.

Patented June 28, 1910. Serial No. 480,395.

To all whom it may concern:

Be it known that I, Roponrnr LINKMEYER, a subject of the German Em eror, and residing at Brussels, Belgium, ave invented a certain new and useful Improved Method of Manufacturing Cellulose Structures, of which the following is a specification.

The present invention relates to methods of manufacturing cellulose structures by means of cupric oxid ammonia solutions, and an im ortant object is to provide a method which is both cheaper and safer to workers than those known heretofore.

As is known, filament structures which shine like silk can be precipitated directly from solutions of cellulose in cupric oxid a onia by allowing the solutions to enter tlilgiigh capillary tubes into caustic alkali lyes. Concentrated and heated soda lye has 'nerall '.been employed heretofore because diluted e acts tooslowly, and, in the event of its coii kaining less than 5% caustic alkali, it does not Ieven provide slightly durable structure for example shinm filaments, .which can be used in practice. urther, solutions of salts which react neutral or alkaline, such as sodium chlorid or sodium carbonate,' have been used-heretofore as the ooagent ,when manufacturing .filaments'o cupric oxid cellulose ammonia so-- lutions. But these also have only a slow precipitating action and therefore cannbt be used under. special conditions.

Now it has been found that the coagulation of the cellulose dissolved in cupric ox id ammonia can take place in alkaline or earth-alkaline chlorid solutions when the latter have added to them hydroxid or potassium hydroxid for increasmg the power of coagulation. Ithas been observed small addition of these alkaliesto the'chloridsalts lends a considerable favor of coagulation. In addition it has observed that the structures coagulated this manner,

agulatmtg have they same properties as those which have been coagulated in pure sodalye. The

filaments coagulated with alkaline chlorin salts are-glass like, trans arent, elastic and 1mmediately after ieir precipitation.

The method or processacoording to the invention therefore consists substantially in dissolving cellulose in .cupric oxid ammonia, and in forming these solutions into optional,

fist-shapes, and in then coagulating them in for example fine filaments,

alkaline chlorid'haths which have caustic alkalies added to them.

The invention may be carried into practice as follows z-About 28 kilograms of SOfllUlfl chlorid are dissolved in 100 liters of water, and 3 to 5 more kilograms of sodium oxid hydrate are added to the solution thus obtained. The whole mixture thus obtained is boiled and is preferably used -while it is still hot. 6

Besides the above described method, the rcquiredsodium oxid hydrate can also be made by soda and caustic lye being added to the salt solution, or also electrically directly from the sodium chlorid by a part of the issolved sodium 0 lorid being split up by the action of an electric current into chlorin and sodium h rate, and the former peing removed from tli sodium chlorid soluion.- A

It will be readily understood that the new method or process a' higher practical value as compared with those in which pure soda lyens employed as the precipitating liqu d, since the .manufac'tnring costs are considerably diminished-owing to alkaline chlorids being employed which have a very small commercial value A further advantage of the new method is that owing to working in alkaline salt solutions, the manufacture is also much easier, for manipulations in concentrated soda-' -lyes are dangerous fon the workers and attack their hands to every serious extent.

What I claim as m invention and desire to secure by Letters katent is z- 1. Method of manufacturing cellulose structur es consisting in dissolving cellulose 1n cupric oxid ammonia, in forming the solution thus, obtained :into shapes corresponding to the purpose in each instance, and in coagulating the bodies thus obtained in alkaline chlorid 'tively small quantities of caustic alkalies.

2, Method of manufacturing cellulose structures, consisting in dissolving cellulose 'in cupric 'oxid ammonia, in forming thQ solution thus obtained into shapes, and in said formed shapes in a so1u-* coagulatin tion compris ng 90 liters of water, about 28: 1.05

f sodium chlorid and about -5 kilograms of ustic alkali.

3. The meth of manufacturing cellulose structures which consists in forming a ouprokilograms o ammonium cellulose solution, producing '110,

baths containing relas suitable shapes therefrom, andooa-gulafing of a chlorid of a metal of the alkalies con- 10 the shapes thus produced in a solution of up taining cqustic alkali. alkaline metal chlorid containing caustle In testlmony whereof, I aflix my signawlkulih. f f 1 I V ture in the presence of two witnesses.

4-. T e method 0 manu acturing ce lu ose structures, which consists in forming a BUDOIIH LINKMEYER' cupro-ammoniumcellulose selut-ion, pro 110- Witnesses:

ing suitable shapes therefrom and coa Iat- GREGORY PHELAN,

' ing the shapes thus produced in a s0 ution ETHELBERT WATTS. 

